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<title>搜索帮助</title>
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  <table border="1">
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        <th>语法</th>
        <th>效果</th>
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        <td>jack</td>
        <td>查询包含jack关键词语</td>
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        <td>jack london (jack or london)</td>
        <td>查询包含 jack 或者 london 或两者</td>
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        <td>+jack +london (jack and london)</td>
        <td>查询 jack 和 london (jack和london同时出现)   </td>
      </tr>
      <tr>
        <td>jack*</td>
        <td>查询以jack字符串开头</td>
      </tr>
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        <td>jack~</td>
        <td>查询接近jack字符串</td>
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